/*! `swift` grammar compiled for Highlight.js 11.9.0 */
var hljsGrammar = (function () {
  'use strict';

  /**
   * @param {string} value
   * @returns {RegExp}
   * */

  /**
   * @param {RegExp | string } re
   * @returns {string}
   */
  function source(re) {
    if (!re) return null;
    if (typeof re === "string") return re;

    return re.source;
  }

  /**
   * @param {RegExp | string } re
   * @returns {string}
   */
  function lookahead(re) {
    return concat('(?=', re, ')');
  }

  /**
   * @param {...(RegExp | string) } args
   * @returns {string}
   */
  function concat(...args) {
    const joined = args.map((x) => source(x)).join("");
    return joined;
  }

  /**
   * @param { Array<string | RegExp | Object> } args
   * @returns {object}
   */
  function stripOptionsFromArgs(args) {
    const opts = args[args.length - 1];

    if (typeof opts === 'object' && opts.constructor === Object) {
      args.splice(args.length - 1, 1);
      return opts;
    } else {
      return {};
    }
  }

  /** @typedef { {capture?: boolean} } RegexEitherOptions */

  /**
   * Any of the passed expresssions may match
   *
   * Creates a huge this | this | that | that match
   * @param {(RegExp | string)[] | [...(RegExp | string)[], RegexEitherOptions]} args
   * @returns {string}
   */
  function either(...args) {
    /** @type { object & {capture?: boolean} }  */
    const opts = stripOptionsFromArgs(args);
    const joined = '('
      + (opts.capture ? "" : "?:")
      + args.map((x) => source(x)).join("|") + ")";
    return joined;
  }

  const keywordWrapper = keyword => concat(
    /\b/,
    keyword,
    /\w$/.test(keyword) ? /\b/ : /\B/
  );

  // Keywords that require a leading dot.
  const dotKeywords = [
    'Protocol', // contextual
    'Type' // contextual
  ].map(keywordWrapper);

  // Keywords that may have a leading dot.
  const optionalDotKeywords = [
    'init',
    'self'
  ].map(keywordWrapper);

  // should register as keyword, not type
  const keywordTypes = [
    'Any',
    'Self'
  ];

  // Regular keywords and literals.
  const keywords = [
    // strings below will be fed into the regular `keywords` engine while regex
    // will result in additional modes being created to scan for those keywords to
    // avoid conflicts with other rules
    'actor',
    'any', // contextual
    'associatedtype',
    'async',
    'await',
    /as\?/, // operator
    /as!/, // operator
    'as', // operator
    'borrowing', // contextual
    'break',
    'case',
    'catch',
    'class',
    'consume', // contextual
    'consuming', // contextual
    'continue',
    'convenience', // contextual
    'copy', // contextual
    'default',
    'defer',
    'deinit',
    'didSet', // contextual
    'distributed',
    'do',
    'dynamic', // contextual
    'each',
    'else',
    'enum',
    'extension',
    'fallthrough',
    /fileprivate\(set\)/,
    'fileprivate',
    'final', // contextual
    'for',
    'func',
    'get', // contextual
    'guard',
    'if',
    'import',
    'indirect', // contextual
    'infix', // contextual
    /init\?/,
    /init!/,
    'inout',
    /internal\(set\)/,
    'internal',
    'in',
    'is', // operator
    'isolated', // contextual
    'nonisolated', // contextual
    'lazy', // contextual
    'let',
    'macro',
    'mutating', // contextual
    'nonmutating', // contextual
    /open\(set\)/, // contextual
    'open', // contextual
    'operator',
    'optional', // contextual
    'override', // contextual
    'postfix', // contextual
    'precedencegroup',
    'prefix', // contextual
    /private\(set\)/,
    'private',
    'protocol',
    /public\(set\)/,
    'public',
    'repeat',
    'required', // contextual
    'rethrows',
    'return',
    'set', // contextual
    'some', // contextual
    'static',
    'struct',
    'subscript',
    'super',
    'switch',
    'throws',
    'throw',
    /try\?/, // operator
    /try!/, // operator
    'try', // operator
    'typealias',
    /unowned\(safe\)/, // contextual
    /unowned\(unsafe\)/, // contextual
    'unowned', // contextual
    'var',
    'weak', // contextual
    'where',
    'while',
    'willSet' // contextual
  ];

  // NOTE: Contextual keywords are reserved only in specific contexts.
  // Ideally, these should be matched using modes to avoid false positives.

  // Literals.
  const literals = [
    'false',
    'nil',
    'true'
  ];

  // Keywords used in precedence groups.
  const precedencegroupKeywords = [
    'assignment',
    'associativity',
    'higherThan',
    'left',
    'lowerThan',
    'none',
    'right'
  ];

  // Keywords that start with a number sign (#).
  // #(un)available is handled separately.
  const numberSignKeywords = [
    '#colorLiteral',
    '#column',
    '#dsohandle',
    '#else',
    '#elseif',
    '#endif',
    '#error',
    '#file',
    '#fileID',
    '#fileLiteral',
    '#filePath',
    '#function',
    '#if',
    '#imageLiteral',
    '#keyPath',
    '#line',
    '#selector',
    '#sourceLocation',
    '#warning'
  ];

  // Global functions in the Standard Library.
  const builtIns = [
    'abs',
    'all',
    'any',
    'assert',
    'assertionFailure',
    'debugPrint',
    'dump',
    'fatalError',
    'getVaList',
    'isKnownUniquelyReferenced',
    'max',
    'min',
    'numericCast',
    'pointwiseMax',
    'pointwiseMin',
    'precondition',
    'preconditionFailure',
    'print',
    'readLine',
    'repeatElement',
    'sequence',
    'stride',
    'swap',
    'swift_unboxFromSwiftValueWithType',
    'transcode',
    'type',
    'unsafeBitCast',
    'unsafeDowncast',
    'withExtendedLifetime',
    'withUnsafeMutablePointer',
    'withUnsafePointer',
    'withVaList',
    'withoutActuallyEscaping',
    'zip'
  ];

  // Valid first characters for operators.
  const operatorHead = either(
    /[/=\-+!*%<>&|^~?]/,
    /[\u00A1-\u00A7]/,
    /[\u00A9\u00AB]/,
    /[\u00AC\u00AE]/,
    /[\u00B0\u00B1]/,
    /[\u00B6\u00BB\u00BF\u00D7\u00F7]/,
    /[\u2016-\u2017]/,
    /[\u2020-\u2027]/,
    /[\u2030-\u203E]/,
    /[\u2041-\u2053]/,
    /[\u2055-\u205E]/,
    /[\u2190-\u23FF]/,
    /[\u2500-\u2775]/,
    /[\u2794-\u2BFF]/,
    /[\u2E00-\u2E7F]/,
    /[\u3001-\u3003]/,
    /[\u3008-\u3020]/,
    /[\u3030]/
  );

  // Valid characters for operators.
  const operatorCharacter = either(
    operatorHead,
    /[\u0300-\u036F]/,
    /[\u1DC0-\u1DFF]/,
    /[\u20D0-\u20FF]/,
    /[\uFE00-\uFE0F]/,
    /[\uFE20-\uFE2F]/
    // TODO: The following characters are also allowed, but the regex isn't supported yet.
    // /[\u{E0100}-\u{E01EF}]/u
  );

  // Valid operator.
  const operator = concat(operatorHead, operatorCharacter, '*');

  // Valid first characters for identifiers.
  const identifierHead = either(
    /[a-zA-Z_]/,
    /[\u00A8\u00AA\u00AD\u00AF\u00B2-\u00B5\u00B7-\u00BA]/,
    /[\u00BC-\u00BE\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u00FF]/,
    /[\u0100-\u02FF\u0370-\u167F\u1681-\u180D\u180F-\u1DBF]/,
    /[\u1E00-\u1FFF]/,
    /[\u200B-\u200D\u202A-\u202E\u203F-\u2040\u2054\u2060-\u206F]/,
    /[\u2070-\u20CF\u2100-\u218F\u2460-\u24FF\u2776-\u2793]/,
    /[\u2C00-\u2DFF\u2E80-\u2FFF]/,
    /[\u3004-\u3007\u3021-\u302F\u3031-\u303F\u3040-\uD7FF]/,
    /[\uF900-\uFD3D\uFD40-\uFDCF\uFDF0-\uFE1F\uFE30-\uFE44]/,
    /[\uFE47-\uFEFE\uFF00-\uFFFD]/ // Should be /[\uFE47-\uFFFD]/, but we have to exclude FEFF.
    // The following characters are also allowed, but the regexes aren't supported yet.
    // /[\u{10000}-\u{1FFFD}\u{20000-\u{2FFFD}\u{30000}-\u{3FFFD}\u{40000}-\u{4FFFD}]/u,
    // /[\u{50000}-\u{5FFFD}\u{60000-\u{6FFFD}\u{70000}-\u{7FFFD}\u{80000}-\u{8FFFD}]/u,
    // /[\u{90000}-\u{9FFFD}\u{A0000-\u{AFFFD}\u{B0000}-\u{BFFFD}\u{C0000}-\u{CFFFD}]/u,
    // /[\u{D0000}-\u{DFFFD}\u{E0000-\u{EFFFD}]/u
  );

  // Valid characters for identifiers.
  const identifierCharacter = either(
    identifierHead,
    /\d/,
    /[\u0300-\u036F\u1DC0-\u1DFF\u20D0-\u20FF\uFE20-\uFE2F]/
  );

  // Valid identifier.
  const identifier = concat(identifierHead, identifierCharacter, '*');

  // Valid type identifier.
  const typeIdentifier = concat(/[A-Z]/, identifierCharacter, '*');

  // Built-in attributes, which are highlighted as keywords.
  // @available is handled separately.
  // https://docs.swift.org/swift-book/documentation/the-swift-programming-language/attributes
  const keywordAttributes = [
    'attached',
    'autoclosure',
    concat(/convention\(/, either('swift', 'block', 'c'), /\)/),
    'discardableResult',
    'dynamicCallable',
    'dynamicMemberLookup',
    'escaping',
    'freestanding',
    'frozen',
    'GKInspectable',
    'IBAction',
    'IBDesignable',
    'IBInspectable',
    'IBOutlet',
    'IBSegueAction',
    'inlinable',
    'main',
    'nonobjc',
    'NSApplicationMain',
    'NSCopying',
    'NSManaged',
    concat(/objc\(/, identifier, /\)/),
    'objc',
    'objcMembers',
    'propertyWrapper',
    'requires_stored_property_inits',
    'resultBuilder',
    'Sendable',
    'testable',
    'UIApplicationMain',
    'unchecked',
    'unknown',
    'usableFromInline',
    'warn_unqualified_access'
  ];

  // Contextual keywords used in @available and #(un)available.
  const availabilityKeywords = [
    'iOS',
    'iOSApplicationExtension',
    'macOS',
    'macOSApplicationExtension',
    'macCatalyst',
    'macCatalystApplicationExtension',
    'watchOS',
    'watchOSApplicationExtension',
    'tvOS',
    'tvOSApplicationExtension',
    'swift'
  ];

  /*
  Language: Swift
  Description: Swift is a general-purpose programming language built using a modern approach to safety, performance, and software design patterns.
  Author: Steven Van Impe <steven.vanimpe@icloud.com>
  Contributors: Chris Eidhof <chris@eidhof.nl>, Nate Cook <natecook@gmail.com>, Alexander Lichter <manniL@gmx.net>, Richard Gibson <gibson042@github>
  Website: https://swift.org
  Category: common, system
  */


  /** @type LanguageFn */
  function swift(hljs) {
    const WHITESPACE = {
      match: /\s+/,
      relevance: 0
    };
    // https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#ID411
    const BLOCK_COMMENT = hljs.COMMENT(
      '/\\*',
      '\\*/',
      { contains: [ 'self' ] }
    );
    const COMMENTS = [
      hljs.C_LINE_COMMENT_MODE,
      BLOCK_COMMENT
    ];

    // https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#ID413
    // https://docs.swift.org/swift-book/ReferenceManual/zzSummaryOfTheGrammar.html
    const DOT_KEYWORD = {
      match: [
        /\./,
        either(...dotKeywords, ...optionalDotKeywords)
      ],
      className: { 2: "keyword" }
    };
    const KEYWORD_GUARD = {
      // Consume .keyword to prevent highlighting properties and methods as keywords.
      match: concat(/\./, either(...keywords)),
      relevance: 0
    };
    const PLAIN_KEYWORDS = keywords
      .filter(kw => typeof kw === 'string')
      .concat([ "_|0" ]); // seems common, so 0 relevance
    const REGEX_KEYWORDS = keywords
      .filter(kw => typeof kw !== 'string') // find regex
      .concat(keywordTypes)
      .map(keywordWrapper);
    const KEYWORD = { variants: [
      {
        className: 'keyword',
        match: either(...REGEX_KEYWORDS, ...optionalDotKeywords)
      }
    ] };
    // find all the regular keywords
    const KEYWORDS = {
      $pattern: either(
        /\b\w+/, // regular keywords
        /#\w+/ // number keywords
      ),
      keyword: PLAIN_KEYWORDS
        .concat(numberSignKeywords),
      literal: literals
    };
    const KEYWORD_MODES = [
      DOT_KEYWORD,
      KEYWORD_GUARD,
      KEYWORD
    ];

    // https://github.com/apple/swift/tree/main/stdlib/public/core
    const BUILT_IN_GUARD = {
      // Consume .built_in to prevent highlighting properties and methods.
      match: concat(/\./, either(...builtIns)),
      relevance: 0
    };
    const BUILT_IN = {
      className: 'built_in',
      match: concat(/\b/, either(...builtIns), /(?=\()/)
    };
    const BUILT_INS = [
      BUILT_IN_GUARD,
      BUILT_IN
    ];

    // https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#ID418
    const OPERATOR_GUARD = {
      // Prevent -> from being highlighting as an operator.
      match: /->/,
      relevance: 0
    };
    const OPERATOR = {
      className: 'operator',
      relevance: 0,
      variants: [
        { match: operator },
        {
          // dot-operator: only operators that start with a dot are allowed to use dots as
          // characters (..., ...<, .*, etc). So there rule here is: a dot followed by one or more
          // characters that may also include dots.
          match: `\\.(\\.|${operatorCharacter})+` }
      ]
    };
    const OPERATORS = [
      OPERATOR_GUARD,
      OPERATOR
    ];

    // https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#grammar_numeric-literal
    // TODO: Update for leading `-` after lookbehind is supported everywhere
    const decimalDigits = '([0-9]_*)+';
    const hexDigits = '([0-9a-fA-F]_*)+';
    const NUMBER = {
      className: 'number',
      relevance: 0,
      variants: [
        // decimal floating-point-literal (subsumes decimal-literal)
        { match: `\\b(${decimalDigits})(\\.(${decimalDigits}))?` + `([eE][+-]?(${decimalDigits}))?\\b` },
        // hexadecimal floating-point-literal (subsumes hexadecimal-literal)
        { match: `\\b0x(${hexDigits})(\\.(${hexDigits}))?` + `([pP][+-]?(${decimalDigits}))?\\b` },
        // octal-literal
        { match: /\b0o([0-7]_*)+\b/ },
        // binary-literal
        { match: /\b0b([01]_*)+\b/ }
      ]
    };

    // https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#grammar_string-literal
    const ESCAPED_CHARACTER = (rawDelimiter = "") => ({
      className: 'subst',
      variants: [
        { match: concat(/\\/, rawDelimiter, /[0\\tnr"']/) },
        { match: concat(/\\/, rawDelimiter, /u\{[0-9a-fA-F]{1,8}\}/) }
      ]
    });
    const ESCAPED_NEWLINE = (rawDelimiter = "") => ({
      className: 'subst',
      match: concat(/\\/, rawDelimiter, /[\t ]*(?:[\r\n]|\r\n)/)
    });
    const INTERPOLATION = (rawDelimiter = "") => ({
      className: 'subst',
      label: "interpol",
      begin: concat(/\\/, rawDelimiter, /\(/),
      end: /\)/
    });
    const MULTILINE_STRING = (rawDelimiter = "") => ({
      begin: concat(rawDelimiter, /"""/),
      end: concat(/"""/, rawDelimiter),
      contains: [
        ESCAPED_CHARACTER(rawDelimiter),
        ESCAPED_NEWLINE(rawDelimiter),
        INTERPOLATION(rawDelimiter)
      ]
    });
    const SINGLE_LINE_STRING = (rawDelimiter = "") => ({
      begin: concat(rawDelimiter, /"/),
      end: concat(/"/, rawDelimiter),
      contains: [
        ESCAPED_CHARACTER(rawDelimiter),
        INTERPOLATION(rawDelimiter)
      ]
    });
    const STRING = {
      className: 'string',
      variants: [
        MULTILINE_STRING(),
        MULTILINE_STRING("#"),
        MULTILINE_STRING("##"),
        MULTILINE_STRING("###"),
        SINGLE_LINE_STRING(),
        SINGLE_LINE_STRING("#"),
        SINGLE_LINE_STRING("##"),
        SINGLE_LINE_STRING("###")
      ]
    };

    const REGEXP_CONTENTS = [
      hljs.BACKSLASH_ESCAPE,
      {
        begin: /\[/,
        end: /\]/,
        relevance: 0,
        contains: [ hljs.BACKSLASH_ESCAPE ]
      }
    ];

    const BARE_REGEXP_LITERAL = {
      begin: /\/[^\s](?=[^/\n]*\/)/,
      end: /\//,
      contains: REGEXP_CONTENTS
    };

    const EXTENDED_REGEXP_LITERAL = (rawDelimiter) => {
      const begin = concat(rawDelimiter, /\//);
      const end = concat(/\//, rawDelimiter);
      return {
        begin,
        end,
        contains: [
          ...REGEXP_CONTENTS,
          {
            scope: "comment",
            begin: `#(?!.*${end})`,
            end: /$/,
          },
        ],
      };
    };

    // https://docs.swift.org/swift-book/documentation/the-swift-programming-language/lexicalstructure/#Regular-Expression-Literals
    const REGEXP = {
      scope: "regexp",
      variants: [
        EXTENDED_REGEXP_LITERAL('###'),
        EXTENDED_REGEXP_LITERAL('##'),
        EXTENDED_REGEXP_LITERAL('#'),
        BARE_REGEXP_LITERAL
      ]
    };

    // https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html#ID412
    const QUOTED_IDENTIFIER = { match: concat(/`/, identifier, /`/) };
    const IMPLICIT_PARAMETER = {
      className: 'variable',
      match: /\$\d+/
    };
    const PROPERTY_WRAPPER_PROJECTION = {
      className: 'variable',
      match: `\\$${identifierCharacter}+`
    };
    const IDENTIFIERS = [
      QUOTED_IDENTIFIER,
      IMPLICIT_PARAMETER,
      PROPERTY_WRAPPER_PROJECTION
    ];

    // https://docs.swift.org/swift-book/ReferenceManual/Attributes.html
    const AVAILABLE_ATTRIBUTE = {
      match: /(@|#(un)?)available/,
      scope: 'keyword',
      starts: { contains: [
        {
          begin: /\(/,
          end: /\)/,
          keywords: availabilityKeywords,
          contains: [
            ...OPERATORS,
            NUMBER,
            STRING
          ]
        }
      ] }
    };
    const KEYWORD_ATTRIBUTE = {
      scope: 'keyword',
      match: concat(/@/, either(...keywordAttributes))
    };
    const USER_DEFINED_ATTRIBUTE = {
      scope: 'meta',
      match: concat(/@/, identifier)
    };
    const ATTRIBUTES = [
      AVAILABLE_ATTRIBUTE,
      KEYWORD_ATTRIBUTE,
      USER_DEFINED_ATTRIBUTE
    ];

    // https://docs.swift.org/swift-book/ReferenceManual/Types.html
    const TYPE = {
      match: lookahead(/\b[A-Z]/),
      relevance: 0,
      contains: [
        { // Common Apple frameworks, for relevance boost
          className: 'type',
          match: concat(/(AV|CA|CF|CG|CI|CL|CM|CN|CT|MK|MP|MTK|MTL|NS|SCN|SK|UI|WK|XC)/, identifierCharacter, '+')
        },
        { // Type identifier
          className: 'type',
          match: typeIdentifier,
          relevance: 0
        },
        { // Optional type
          match: /[?!]+/,
          relevance: 0
        },
        { // Variadic parameter
          match: /\.\.\./,
          relevance: 0
        },
        { // Protocol composition
          match: concat(/\s+&\s+/, lookahead(typeIdentifier)),
          relevance: 0
        }
      ]
    };
    const GENERIC_ARGUMENTS = {
      begin: /</,
      end: />/,
      keywords: KEYWORDS,
      contains: [
        ...COMMENTS,
        ...KEYWORD_MODES,
        ...ATTRIBUTES,
        OPERATOR_GUARD,
        TYPE
      ]
    };
    TYPE.contains.push(GENERIC_ARGUMENTS);

    // https://docs.swift.org/swift-book/ReferenceManual/Expressions.html#ID552
    // Prevents element names from being highlighted as keywords.
    const TUPLE_ELEMENT_NAME = {
      match: concat(identifier, /\s*:/),
      keywords: "_|0",
      relevance: 0
    };
    // Matches tuples as well as the parameter list of a function type.
    const TUPLE = {
      begin: /\(/,
      end: /\)/,
      relevance: 0,
      keywords: KEYWORDS,
      contains: [
        'self',
        TUPLE_ELEMENT_NAME,
        ...COMMENTS,
        REGEXP,
        ...KEYWORD_MODES,
        ...BUILT_INS,
        ...OPERATORS,
        NUMBER,
        STRING,
        ...IDENTIFIERS,
        ...ATTRIBUTES,
        TYPE
      ]
    };

    const GENERIC_PARAMETERS = {
      begin: /</,
      end: />/,
      keywords: 'repeat each',
      contains: [
        ...COMMENTS,
        TYPE
      ]
    };
    const FUNCTION_PARAMETER_NAME = {
      begin: either(
        lookahead(concat(identifier, /\s*:/)),
        lookahead(concat(identifier, /\s+/, identifier, /\s*:/))
      ),
      end: /:/,
      relevance: 0,
      contains: [
        {
          className: 'keyword',
          match: /\b_\b/
        },
        {
          className: 'params',
          match: identifier
        }
      ]
    };
    const FUNCTION_PARAMETERS = {
      begin: /\(/,
      end: /\)/,
      keywords: KEYWORDS,
      contains: [
        FUNCTION_PARAMETER_NAME,
        ...COMMENTS,
        ...KEYWORD_MODES,
        ...OPERATORS,
        NUMBER,
        STRING,
        ...ATTRIBUTES,
        TYPE,
        TUPLE
      ],
      endsParent: true,
      illegal: /["']/
    };
    // https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID362
    // https://docs.swift.org/swift-book/documentation/the-swift-programming-language/declarations/#Macro-Declaration
    const FUNCTION_OR_MACRO = {
      match: [
        /(func|macro)/,
        /\s+/,
        either(QUOTED_IDENTIFIER.match, identifier, operator)
      ],
      className: {
        1: "keyword",
        3: "title.function"
      },
      contains: [
        GENERIC_PARAMETERS,
        FUNCTION_PARAMETERS,
        WHITESPACE
      ],
      illegal: [
        /\[/,
        /%/
      ]
    };

    // https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID375
    // https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID379
    const INIT_SUBSCRIPT = {
      match: [
        /\b(?:subscript|init[?!]?)/,
        /\s*(?=[<(])/,
      ],
      className: { 1: "keyword" },
      contains: [
        GENERIC_PARAMETERS,
        FUNCTION_PARAMETERS,
        WHITESPACE
      ],
      illegal: /\[|%/
    };
    // https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID380
    const OPERATOR_DECLARATION = {
      match: [
        /operator/,
        /\s+/,
        operator
      ],
      className: {
        1: "keyword",
        3: "title"
      }
    };

    // https://docs.swift.org/swift-book/ReferenceManual/Declarations.html#ID550
    const PRECEDENCEGROUP = {
      begin: [
        /precedencegroup/,
        /\s+/,
        typeIdentifier
      ],
      className: {
        1: "keyword",
        3: "title"
      },
      contains: [ TYPE ],
      keywords: [
        ...precedencegroupKeywords,
        ...literals
      ],
      end: /}/
    };

    // Add supported submodes to string interpolation.
    for (const variant of STRING.variants) {
      const interpolation = variant.contains.find(mode => mode.label === "interpol");
      // TODO: Interpolation can contain any expression, so there's room for improvement here.
      interpolation.keywords = KEYWORDS;
      const submodes = [
        ...KEYWORD_MODES,
        ...BUILT_INS,
        ...OPERATORS,
        NUMBER,
        STRING,
        ...IDENTIFIERS
      ];
      interpolation.contains = [
        ...submodes,
        {
          begin: /\(/,
          end: /\)/,
          contains: [
            'self',
            ...submodes
          ]
        }
      ];
    }

    return {
      name: 'Swift',
      keywords: KEYWORDS,
      contains: [
        ...COMMENTS,
        FUNCTION_OR_MACRO,
        INIT_SUBSCRIPT,
        {
          beginKeywords: 'struct protocol class extension enum actor',
          end: '\\{',
          excludeEnd: true,
          keywords: KEYWORDS,
          contains: [
            hljs.inherit(hljs.TITLE_MODE, {
              className: "title.class",
              begin: /[A-Za-z$_][\u00C0-\u02B80-9A-Za-z$_]*/
            }),
            ...KEYWORD_MODES
          ]
        },
        OPERATOR_DECLARATION,
        PRECEDENCEGROUP,
        {
          beginKeywords: 'import',
          end: /$/,
          contains: [ ...COMMENTS ],
          relevance: 0
        },
        REGEXP,
        ...KEYWORD_MODES,
        ...BUILT_INS,
        ...OPERATORS,
        NUMBER,
        STRING,
        ...IDENTIFIERS,
        ...ATTRIBUTES,
        TYPE,
        TUPLE
      ]
    };
  }

  return swift;

})();
;
export default hljsGrammar;